Last time we learned how Henry Cavendish used Christiaan Huygens’ work with pendulums to determine…

Kepler's laws agree with all observed planetary motions, and by the table in the previous…

Fig. 1   The 2004 Venus transit observed from 3 locations by the GONG collaboration Kepler's third law allows one…

We’ve been paying a lot of attention to Venus and its orbital patterns, as did…

 As Already Discussed Newton’s equation to calculate the sun’s gravitational force acting upon Earth, and…

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of…

Last topic we learned that the bigger an optical rangefinder, the better its accuracy in…

 Last time we discussed the fact that ultra fine gradations must be applied to a rangefinder’s indicator…

As We discussed earlier that when optical rangefinders are used to measure the distance to…

We’ve been looking at the indirect methods employed by scientists through the ages as they…